Assigxoe to the goedok



(No Model.)

J. R. MAXWELL.

VALVE MECEANISM POE DUPLEX STEAM PUMPS.

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Patented May 26, 1885.

Inventor Darren dTaTns PATENT Trina.

JAMES R. MAXVELL, OF HAMILTON, OHIO, ASSIGXOR TO THE GORDON 8U MAXVELL COMPAIY, OF SAME PLACE.

VALVE MFCHNISM FOR DUPLEX STEAM-PUMPS.

SEE'JEFIGAZOH :forming part of Letters Patent No. 318,641, dated Mfay 26, 1885.

Application filed February 7, 1585. (No model.)

To @ZZ whom t may concern,.- rod; H, a diagonally-disposed lever of the Be it known that I, JAMBs R. MAXWELL, second order of levers, adapted to transmit of Hamilton, Butler county, Ohio, have inmotion from the piston-rod G to the valve- 55 vented certain new and useful Improvements stem C; I, the fulerum-bearing of the lever H, inValve Mechanism for Duplex Steam-Pumps, formed by a mortise in the arm at the end of of which the following is a specification. the bracket and engaged by the upper end In what are termed duplex steam-pumps of the lever; J, another diagonally-disposed two steam-engines are placed closely side by lever of the iirst order of levers, adapted to 6o side, and the valve of each engine is actuated transmit motion from the piston-rod F to the ro by the piston-rod of the other engine, the valve-stem D; and K, the fulcrum-bearing of transmission between piston-rods and valvethis lever, formed by a pair of jaws, between stems being effected by means of levers. In which engages the fulcrum-boss of the lever. most duplex steam-pumps both slide-valves The twolevers are disposed in planes inter- 65 are alike, being generally in the well-known secting each other, one lever being disposed D form. In such case the transmitting-levers in advance of the other, in order that they through which the valves receive their motion may not interfere with each other. The reci pinust be of different order-for instance, one rocating motion of the piston-rod F is transbeing a lever of the first order, the other a mitted through the lever J to the valve-stem 7o lever of the second order. In cases where D, and the reciprocating motion of the piston- 2o one of the valves is a D-valve and the other rod G is transmitted through the lever H to a B-valve the transmitting-levcrs may be of the valve-stem C, the motions and effects beidentical order. ing such as is common and well known in con- My invention relates to the arrangement of nection with duplex steam-pumps. The valve- 75 mechanism for transmitting motion from the stems, being guided in the lugs E, partake of piston-rods to the valve-stems ofduplex stcamreciprocating motions in a right line, and the pumps. piston-rods also, as usual, reciprocate in a My improvement will be readilyunderstood right line. The lower ends of the levers, in` from the following description, taken in constead of being provided with the usual link 8o nection with the accompanying drawings, in attachments, are provided with cylindrical 3o which swells engaging grooved collars secured to the Figure lis an end view of a device illustratpiston-rods. ing my improvements, the direction of view As the points of valve-stein attachment of being indicated by the arrows b on other iigthe levers move in a right line, it is obvious 85 ures; Fig. 2, a plan of the same, direction of that the fulcruln-points of thelevers, and also view being indicated by arrow a on other ligthe ends which engage the piston-rods, must ures; Fig. 8, a sideview ofthe same, direction approach and recede from the plane of the of view being indicated by arrow c on other valve-stems during the oscillations of the lefigures; Fig. 4, aface view of the lever H, the vers. This movement of approach and rego direction of view being indicated by arrow d cession is permitted at the lower end of the 4o on Fig. l; Fig. 5, a face view of lever J, the levers by a sliding of the end swells in their direction of view being indicated by arrow e grooves, and at the fulcrum-point bythe slidon Fig. l. Fig. 3 is best viewed by turning ing of the fulcrum-bosses in their seats, in an the sheet so the levers project downward. obvious manner. The valve-stems are pro- 95 In the drawings, A represents the usual vided with the usual eyes, and the valve-stein steam-chest, intended to contain both slidepoints of the levers have projecting journals valves; B, the bracket projecting forward cast upon them, which the eyes engage. In from the front of the steamchest between the case of the lever H it will be seen that the the valve-stems; C, one of the usual valve- Alever is supported in position by its engagerca stems; D, the other valve-stem; E, lugs for ment with the valve-stein, which is placed 5o guiding the valve-stems, projecting from the underneath the lever, and by the collar of the sides of the bracket; F, one of the usual pispiston-rod G, which is also underneath the leton-rods of the machine, G, the other pistonver, and the same may be said of the lever J.

Y gregate of twenty-six pieces.

y er, fulcrum-supports for the levers upon the bracket,and guiding-lugs for the valve-Steins,

Upon the back of thc lever H, directly opposite the eye of the valve-stem O, a finished bearing-spot is provided to rub against the iinished bearing-surfaces on the under side of the arm which carries the fulcrum-mortise I. A side bearing is thus provided for the lever to keep it into neat side engagement with the eye of its valve-stem. The lever J in a simi- ]ar manner is provided with a iinished side bearing-spot to the rear of its fulcrum-point engaging the finished bottom of the seat between the jaws which it engages. By this arrangement a snug fitting of parts is secured with a triing amount of machine finish, and the system permits ot' a ready construction of parts upon the interchangeable plan of machine manufacture.

The advantage resulting` from the combination of the different features of this simple improvement may be well comprehended when I explain that I transmit the motions from the two piston-rods to the two valve-stems by means ot' two simple levers of exceedingly cheap construction, while previous constructions adapted for precisely the same ends have involved the use of links, two-part levers, rock-shafts, studs, nuts, &c., forming an ag- I claim as myinventionl. In a valve-operating mechanism for dnpleX steam-pumps, the combination, with two piston-rods and two valve-stems, of two diagonally-disposed levers arranged in planes intersecting` each other, substantially as and for the purpose set forth.

2. In a valve-operating mechanism for dupleX steam-pumps, a steam-chest, a bracket projecting from the frontY thereof, and two diagonally-disposed levers arranged in planes intersecting each other and fulcrumed in supports in said bracket, combined substantially asand for the purpose set forth.

3. In a valve-operating mechanism for dupleX steam-pumps, the combination ofa stea1n chest, two valve-stems, a bracket projecting out-ward from the steam-chest between the two val ve-stems, a pair of diagonally-disposed levers arranged in planes intersecting each othprojecting from the sides of the bracket, substautially as and for the purpose set forth. l

4. In a valve-operating mechanism for dupleX steam-pumps, the combination, with two valve-stems and two piston-rods, ot' aY diagonally-disposed lever of the iirst order and a diagonally-disposed lever of the second order, the two levers being arranged in planes intersecting each other, substantially as and for the purpose set forth.

5. In a valve-operating mechanism for dupleX steam-pumps, the combination, with two valve-stems and two piston-rods, of a pair of levers diagonally disposed in planes intersecting each other, journals projecting from the levers into engagement with eyes on the valve-stem, fulcrunrbosses on the levers engaging fulcrui'n-jaws, and fulcrum-bosses on the ends of the levers engaging grooved collars upon the piston-rods, substantially as and for the purpose set forth.

6. In a valve-operating mechanism for duplex steam-pumps, a pair of valve-stems arranged to reciprocate in right lines, a pair of piston-rods arranged to reciprocate in right lines, and a pair of levers, one engaging each valvestem and the piston-rod which actuates it,the levers being attached to the valve-stein, as set forth, so that such attaching-point of each lever moves in a right line with its valvestem, and attached to their fulcrumsupports and to the piston-rod which drives them in such manner, as set forth, that the piston-rod points andfulcrum-points are capableof approach and recession with reference to the point of valvestem attachment, substantially as set forth.

7. In a valve-operating mechanism for duplex steam-pumps, the combination of steamchest A, bracket B,val vestems C D,provided Y with eyes, guide-lugsrE, piston-rodsFand G,

provided with grooved collars, and levers M and J, provided with journals engaging the eyes of the valve-stems, with fulcrum-bosses, and with end swells engaging the grooved collars, and thejawed fulcrums I and K,formed on the bracket B, substantially as and for the purpose set forth.

JAMES R. MAXWELL.

Witnesses:

J. W. SEE, W. A. SnwARn. 

